Avoid duplicate entries in inline assistant's prompt history (#2926)

Release Notes:

- Improved the inline assistant's prompt history to avoid including the
same entry multiple times. (preview-only)
2bf417fa45Antonio Scandurra committed on 9/1/2023, 7:20:14 AM· committed by GitHubparents7bcc59cd868ec9
1 file changedLine totals unavailable